diff --git a/imgsrc/edit-cut.svg b/imgsrc/edit-cut.svg
index 13d2724fac..0bc092eeea 100644
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diff --git a/imgsrc/edit-paste.svg b/imgsrc/edit-paste.svg
index 523a58cf3b..7be19369d5 100644
--- a/imgsrc/edit-paste.svg
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diff --git a/imgsrc/edit-select-all.svg b/imgsrc/edit-select-all.svg
index 9579247c96..be9fc12271 100644
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@@ -48,17 +48,17 @@
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diff --git a/imgsrc/format-fill-color.svg b/imgsrc/format-fill-color.svg
index e271fae795..301d6babe4 100644
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index 007821df9e..d4fcf8ebb8 100644
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diff --git a/imgsrc/format-text-hr.svg b/imgsrc/format-text-hr.svg
index d8b90818ae..ace5eb2377 100644
--- a/imgsrc/format-text-hr.svg
+++ b/imgsrc/format-text-hr.svg
@@ -14,7 +14,7 @@
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    version="1.1"
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+   inkscape:version="0.92.4 5da689c313, 2019-01-14"
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@@ -26,16 +26,16 @@
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      units="px"
-     inkscape:window-width="3840"
-     inkscape:window-height="2128"
+     inkscape:window-width="2560"
+     inkscape:window-height="1400"
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-     inkscape:window-y="32"
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-       style="fill:#0d5cc6;fill-opacity:1"
+       style="fill:#2caf45;fill-opacity:1"
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diff --git a/imgsrc/format-text-italic.svg b/imgsrc/format-text-italic.svg
index 95b4fe7a7a..b434267590 100644
--- a/imgsrc/format-text-italic.svg
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@@ -15,7 +15,7 @@
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-   inkscape:version="0.91 r13725"
+   inkscape:version="0.92.4 5da689c313, 2019-01-14"
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@@ -23,11 +23,11 @@
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-         style="stop-color:#020e1e;stop-opacity:1"
+         style="stop-color:#0b59bd;stop-opacity:1"
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@@ -50,17 +50,17 @@
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-     inkscape:zoom="15.839192"
+     inkscape:zoom="5.6"
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-     inkscape:window-width="3840"
-     inkscape:window-height="2128"
+     inkscape:window-width="2560"
+     inkscape:window-height="1400"
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-     inkscape:window-y="32"
+     inkscape:window-y="40"
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diff --git a/imgsrc/format-text-strikethrough.svg b/imgsrc/format-text-strikethrough.svg
index 125712143e..538fab184e 100644
--- a/imgsrc/format-text-strikethrough.svg
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@@ -7,7 +7,6 @@
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-   xmlns:xlink="http://www.w3.org/1999/xlink"
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+     id="defs4" />
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-     inkscape:zoom="15.839192"
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-     inkscape:window-width="3840"
-     inkscape:window-height="2128"
+     inkscape:window-width="2560"
+     inkscape:window-height="1400"
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diff --git a/imgsrc/format-text-subscript.svg b/imgsrc/format-text-subscript.svg
index aae27b95cc..49e8de8f87 100644
--- a/imgsrc/format-text-subscript.svg
+++ b/imgsrc/format-text-subscript.svg
@@ -14,7 +14,7 @@
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    version="1.1"
-   inkscape:version="0.91 r13725"
+   inkscape:version="0.92.4 5da689c313, 2019-01-14"
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-     inkscape:window-width="3840"
-     inkscape:window-height="2128"
+     inkscape:window-width="2560"
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diff --git a/imgsrc/format-text-superscript.svg b/imgsrc/format-text-superscript.svg
index 5a083576d3..e033b7b3ee 100644
--- a/imgsrc/format-text-superscript.svg
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diff --git a/imgsrc/format-text-underline.svg b/imgsrc/format-text-underline.svg
index b203d40fac..ff41709eeb 100644
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@@ -14,7 +14,7 @@
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@@ -89,12 +89,12 @@
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        d="m 4.9375164,939.15294 q -3.03516,-0.1641 -3.69141,-0.3282 l -0.24609,-7.2187 q 1.06641,-0.082 3.28125,-0.082 4.92188,0 9.1875006,0.3281 10.82813,0.5742 13.61719,0.5742 7.05469,0 13.78125,-0.2461 9.51562,-0.3281 11.97656,-0.4102 4.59375,0 7.05469,-0.164 l -0.082,1.1484 0.16406,5.25 0,0.7383 q -4.92188,0.7383 -10.17188,0.7383 -4.92187,0 -6.48046,2.0508 -1.06641,1.1484 -1.06641,10.8281 0,1.0664 0.041,2.666 0.041,1.5996 0.041,2.0918 l 0.082,18.7852 1.14844,22.9687 q 0.49219,10.17196 4.18359,16.57036 2.8711,4.8399 7.875,7.5469 7.21875,3.8555 14.51953,3.8555 8.53125,0 15.66797,-2.2969 4.59375,-1.4766 8.1211,-4.1836 3.9375,-2.9531 5.33203,-5.25 2.953113,-4.5937 4.347643,-9.3517 1.72266,-5.98816 1.72266,-18.78506 0,-6.4805 -0.28711,-10.5 -0.28711,-4.0195 -0.90234,-10.0488 -0.61524,-6.0293 -1.10742,-13.084 l -0.32813,-4.8399 q -0.41016,-5.4961 -1.96875,-7.2187 -2.789053,-2.8711 -6.316403,-2.7891 l -8.20312,0.1641 -1.14844,-0.2461 0.16406,-7.0547 6.89063,0 16.816403,0.8203 q 6.23437,0.2461 16.07812,-0.8203 l 1.47656,0.1641 q 0.49219,3.1171 0.49219,4.1835 0,0.5743 -0.32812,2.543 -3.69141,0.9844 -6.89063,1.0664 -5.98828,0.9024 -6.48047,1.3946 -1.23047,1.2304 -1.23047,3.3632 0,0.5743 0.12305,2.2149 0.12305,1.6406 0.12305,2.543 0.65625,1.5585 1.80468,32.4843 0.49219,15.9961 -1.23046,24.93756 -1.23047,6.2344 -3.36329,10.0078 -3.11718,5.3321 -9.18749,10.0899 -6.152343,4.6758 -14.929683,7.3008 -8.94141,2.707 -20.91797,2.707 -13.69922,0 -23.29688,-3.7734 -9.76172,-3.8555 -14.68359,-10.0078 -5.00391,-6.2344 -6.80859,-15.9961 -1.3125,-6.5626 -1.3125,-19.44156 l 0,-27.3164 q 0,-15.4218 -1.39454,-17.4726 -2.05078,-2.9531 -12.0585906,-3.1992 z"
        id="path4141"
-       style="fill:#052147;fill-opacity:1"
+       style="fill:#2271d5;fill-opacity:1"
        inkscape:connector-curvature="0" />
     <path
        d="m 127,1049.5579 0,-5.25 q 0,-1.1484 -0.73828,-1.8867 -0.73828,-0.7383 -1.88672,-0.7383 l -120.7499996,0 q -1.14844,0 -1.88672,0.7383 -0.7382799,0.7383 -0.7382799,1.8867 l 0,5.25 q 0,1.1484 0.7382799,1.8867 0.73828,0.7383 1.88672,0.7383 l 120.7499996,0 q 1.14844,0 1.88672,-0.7383 Q 127,1050.7063 127,1049.5579 Z"
        id="path4"
-       style="fill:#0d5cc6;fill-opacity:1"
+       style="fill:#2caf45;fill-opacity:1"
        inkscape:connector-curvature="0" />
   </g>
 </svg>
diff --git a/imgsrc/generate.py b/imgsrc/generate.py
index 56a32f7791..4a4f9e1546 100755
--- a/imgsrc/generate.py
+++ b/imgsrc/generate.py
@@ -3,7 +3,7 @@
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
 from __future__ import absolute_import, division, print_function, unicode_literals
-import os, glob, subprocess, argparse
+import os, glob, subprocess, argparse, json, hashlib
 
 duplicates = {
     'character-set': ['languages'],
@@ -26,6 +26,13 @@ skip = {'calibre'}
 j = os.path.join
 base = os.path.dirname(os.path.abspath(__file__))
 output_base = j(os.path.dirname(base), 'resources', 'images')
+hash_path = j(os.path.dirname(base), '.build-cache', 'imgsrc-gen.json')
+if os.path.exists(hash_path):
+    with open(hash_path, 'rb') as f:
+        hashes = json.load(f)
+else:
+    hashes = {}
+src_hashes = {}
 
 
 def iterfiles(only=()):
@@ -33,6 +40,9 @@ def iterfiles(only=()):
         name = os.path.relpath(src, base).rpartition('.')[0]
         if only and name not in only:
             continue
+        src_hashes[name] = h = hashlib.sha1(open(src, 'rb').read()).hexdigest()
+        if not only and h == hashes.get(name):
+            continue
         output_names = [n for n in [name] + duplicates.get(name, []) if n not in skip]
         output_files = [j(output_base, n) + '.png' for n in output_names]
         if output_files:
@@ -53,6 +63,8 @@ def render(src, output_files):
         size = sizes.get(oname, '128')
         print('Rendering', oname, 'at size:', size)
         rsvg(src, size, dest)
+        name = os.path.relpath(src, base).rpartition('.')[0]
+        hashes[name] = src_hashes[name]
 
 
 def main():
@@ -61,6 +73,8 @@ def main():
     args = p.parse_args()
     for src, ofiles in iterfiles(args.only):
         render(src, ofiles)
+    with open(hash_path, 'w') as f:
+        json.dump(hashes, f, indent=2, sort_keys=True)
 
 
 if __name__ == '__main__':
diff --git a/imgsrc/insert-link.svg b/imgsrc/insert-link.svg
index 0b56316157..09c7a0db9b 100644
--- a/imgsrc/insert-link.svg
+++ b/imgsrc/insert-link.svg
@@ -15,7 +15,7 @@
    viewBox="0 0 128 128"
    id="svg2"
    version="1.1"
-   inkscape:version="0.91 r13725"
+   inkscape:version="0.92.4 5da689c313, 2019-01-14"
    sodipodi:docname="insert-link.svg">
   <defs
      id="defs4">
@@ -28,7 +28,7 @@
        fx="64"
        fy="999.36212"
        r="29"
-       gradientTransform="matrix(1,0,0,1.0000021,1.0000001e-7,16.480093)"
+       gradientTransform="matrix(1,0,0,1.0000021,1.0000001e-7,11.18662)"
        gradientUnits="userSpaceOnUse" />
     <linearGradient
        inkscape:collect="always"
@@ -42,39 +42,6 @@
          offset="1"
          id="stop4146" />
     </linearGradient>
-    <radialGradient
-       inkscape:collect="always"
-       xlink:href="#linearGradient4142"
-       id="radialGradient4169"
-       cx="61.615429"
-       cy="984.50549"
-       fx="61.615429"
-       fy="984.50549"
-       r="23.865002"
-       gradientTransform="matrix(1,0,0,0.6440184,0,350.46584)"
-       gradientUnits="userSpaceOnUse" />
-    <radialGradient
-       inkscape:collect="always"
-       xlink:href="#linearGradient4142"
-       id="radialGradient4178"
-       gradientUnits="userSpaceOnUse"
-       gradientTransform="matrix(1,0,0,0.6440184,0,350.46584)"
-       cx="61.615429"
-       cy="984.50549"
-       fx="61.615429"
-       fy="984.50549"
-       r="23.865002" />
-    <radialGradient
-       inkscape:collect="always"
-       xlink:href="#linearGradient4142"
-       id="radialGradient4180"
-       gradientUnits="userSpaceOnUse"
-       gradientTransform="matrix(1,0,0,0.6440184,0,350.46584)"
-       cx="61.615429"
-       cy="984.50549"
-       fx="61.615429"
-       fy="984.50549"
-       r="23.865002" />
   </defs>
   <sodipodi:namedview
      id="base"
@@ -83,17 +50,17 @@
      borderopacity="1.0"
      inkscape:pageopacity="0.0"
      inkscape:pageshadow="2"
-     inkscape:zoom="11.2"
+     inkscape:zoom="5.6"
      inkscape:cx="19.843024"
      inkscape:cy="69.707741"
      inkscape:document-units="px"
      inkscape:current-layer="layer1"
      showgrid="false"
      units="px"
-     inkscape:window-width="3840"
-     inkscape:window-height="2128"
+     inkscape:window-width="2560"
+     inkscape:window-height="1400"
      inkscape:window-x="0"
-     inkscape:window-y="32"
+     inkscape:window-y="40"
      inkscape:window-maximized="0" />
   <metadata
      id="metadata7">
@@ -144,42 +111,35 @@
      inkscape:groupmode="layer"
      id="layer1"
      transform="translate(0,-924.36216)">
+    <path
+       inkscape:connector-curvature="0"
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+       id="path6"
+       style="fill:#2271d5;fill-opacity:1;stroke-width:1.28045213" />
+    <path
+       inkscape:connector-curvature="0"
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+       id="path8"
+       style="fill:#2271d5;fill-opacity:1;stroke-width:1.28045213" />
     <g
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-      </g>
+       id="g4145"
+       style="fill:#2caf45;fill-opacity:1"
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       <path
-         style="fill:url(#radialGradient4148);fill-opacity:1"
-         id="path4-3"
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+         style="fill:#2caf45;fill-opacity:1"
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+         inkscape:connector-curvature="0" />
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+         style="fill:#2caf45;fill-opacity:1"
+         id="path10"
+         d="m 85.480431,984.49997 c 0,-2.559 -0.703,-4.968 -1.936,-7.097 -2.508,0.169 -4.72,1.2 -6.188,2.719 0.9,1.294 1.425,2.785 1.43,4.378 v 0 c 0,4.791 -4.631,8.681 -10.326,8.681 h -13.691 c -5.69,0 -10.326,-3.891 -10.326,-8.681 v 0 c 0,-1.64 0.558,-3.168 1.5,-4.472 -1.5,-1.5 -3.736,-2.494 -6.253003,-2.625 -1.237,2.119 -1.94,4.538 -1.94,7.097 v 0 c 0,8.475 7.636003,15.375 17.024003,15.375 h 13.687 c 9.383,0 17.019,-6.899 17.019,-15.375 z"
          inkscape:connector-curvature="0" />
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+    <path
+       inkscape:connector-curvature="0"
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+       id="path4-3"
+       style="fill:url(#radialGradient4148);fill-opacity:1" />
   </g>
 </svg>
diff --git a/imgsrc/trash.svg b/imgsrc/trash.svg
index dfa549db82..a9b5cd9bb4 100644
--- a/imgsrc/trash.svg
+++ b/imgsrc/trash.svg
@@ -14,7 +14,7 @@
    viewBox="0 0 128 128"
    id="svg2"
    version="1.1"
-   inkscape:version="0.91 r13725"
+   inkscape:version="0.92.4 5da689c313, 2019-01-14"
    sodipodi:docname="trash.svg">
   <defs
      id="defs4" />
@@ -25,17 +25,17 @@
      borderopacity="1.0"
      inkscape:pageopacity="0.0"
      inkscape:pageshadow="2"
-     inkscape:zoom="11.2"
+     inkscape:zoom="7.919596"
      inkscape:cx="16.864956"
      inkscape:cy="69.707741"
      inkscape:document-units="px"
      inkscape:current-layer="layer1"
      showgrid="true"
      units="px"
-     inkscape:window-width="3840"
-     inkscape:window-height="2128"
+     inkscape:window-width="2560"
+     inkscape:window-height="1400"
      inkscape:window-x="0"
-     inkscape:window-y="32"
+     inkscape:window-y="40"
      inkscape:window-maximized="0">
     <inkscape:grid
        type="xygrid"
@@ -93,37 +93,37 @@
     <g
        id="g4166"
        transform="matrix(1.2599874,0,0,1.2599874,79.119219,-229.07794)"
-       style="fill:#338000">
+       style="fill:#2caf45;fill-opacity:1">
       <path
          id="path4"
          d="m -32.474,970.74016 4.475,2.738 c 0.755,0 1.136,-0.312 1.136,-0.936 0,-0.399 -0.182,-0.954 -0.534,-1.669 l -9.887,-18.571 -21.912,0.536 c -0.98,0.046 -1.469,0.557 -1.469,1.536 0,0.223 0.311,0.534 0.935,0.935 l 4.543,2.738 -4.81,7.48 c -1.335,2.139 -2.003,3.901 -2.003,5.28 0,1.25 0.442,2.652 1.335,4.209 l 14.897,25.98404 c -0.357,-1.646 -0.534,-3.206 -0.534,-4.677 0,-2.62304 0.821,-5.20904 2.47,-7.74804 l 11.358,-17.835 0,0 z"
          inkscape:connector-curvature="0"
-         style="fill:#338000" />
+         style="fill:#2caf45;fill-opacity:1" />
       <path
          id="path6"
          d="m -26.729,955.57716 12.291,-19.038 c -4.59,-10.464 -9.466,-15.7 -14.63,-15.7 -3.119,0 -5.208,0.871 -6.277,2.605 l -11.626,18.573 20.242,13.56 0,0 z"
          inkscape:connector-curvature="0"
-         style="fill:#338000" />
+         style="fill:#2caf45;fill-opacity:1" />
       <path
          id="path8"
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          inkscape:connector-curvature="0"
-         style="fill:#338000" />
+         style="fill:#2caf45;fill-opacity:1" />
       <path
          id="path10"
          d="m 12.083,951.03416 10.553,-17.77 c 0.355,-0.621 0.534,-1.269 0.534,-1.936 0,-0.802 -0.267,-1.203 -0.8,-1.203 0.084,0 -0.268,0.134 -1.069,0.401 l -4.81,2.204 -4.408,-8.75 c -1.962,-3.918 -5.879,-5.879 -11.758,-5.879 l -27.454,0 c 3.339,1.026 5.609,2.027 6.812,3.006 2.807,2.228 5.678,6.413 8.617,12.558 l 5.479,11.491 -4.077,1.938 c -0.4,0.18 -0.6,0.534 -0.6,1.068 0,0.668 0.421,1.05 1.269,1.136 l 21.712,1.736 0,0 z"
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-         style="fill:#338000" />
+         style="fill:#2caf45;fill-opacity:1" />
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          id="path12"
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+         style="fill:#2caf45;fill-opacity:1" />
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diff --git a/resources/images/edit-cut.png b/resources/images/edit-cut.png
index 9d1dda1b32..fc857db739 100644
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diff --git a/resources/images/edit-paste.png b/resources/images/edit-paste.png
index 59b571dfe4..9085e3df3e 100644
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diff --git a/resources/images/edit-select-all.png b/resources/images/edit-select-all.png
index e677bf7294..5eaa5cbb56 100644
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diff --git a/resources/images/format-fill-color.png b/resources/images/format-fill-color.png
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diff --git a/resources/images/format-indent-less.png b/resources/images/format-indent-less.png
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diff --git a/resources/images/format-justify-center.png b/resources/images/format-justify-center.png
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diff --git a/resources/images/format-justify-fill.png b/resources/images/format-justify-fill.png
index 9fc6a2e4f7..e98ef5fe0e 100644
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diff --git a/resources/images/format-justify-left.png b/resources/images/format-justify-left.png
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diff --git a/resources/images/format-list-ordered.png b/resources/images/format-list-ordered.png
index 2aff6ec4df..769d3e201d 100644
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diff --git a/resources/images/format-list-unordered.png b/resources/images/format-list-unordered.png
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diff --git a/resources/images/format-text-bold.png b/resources/images/format-text-bold.png
index d8d3c1b721..f185fe62b0 100644
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diff --git a/resources/images/format-text-color.png b/resources/images/format-text-color.png
index 661457cf61..2f62ae6ded 100644
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diff --git a/resources/images/format-text-heading.png b/resources/images/format-text-heading.png
index 79a539372d..ba93ca6b1f 100644
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diff --git a/resources/images/format-text-hr.png b/resources/images/format-text-hr.png
index 1503679e6a..294df4911f 100644
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diff --git a/resources/images/format-text-italic.png b/resources/images/format-text-italic.png
index bb3b94f108..c8cb520438 100644
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diff --git a/resources/images/format-text-strikethrough.png b/resources/images/format-text-strikethrough.png
index 2a6f03d9b9..f623b59fde 100644
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diff --git a/resources/images/format-text-subscript.png b/resources/images/format-text-subscript.png
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diff --git a/resources/images/format-text-superscript.png b/resources/images/format-text-superscript.png
index 90f6288004..b81337d9fa 100644
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diff --git a/resources/images/format-text-underline.png b/resources/images/format-text-underline.png
index 0aa434d1da..8afbeb2b75 100644
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diff --git a/resources/images/insert-link.png b/resources/images/insert-link.png
index 57ad099efb..12f65a2c22 100644
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diff --git a/resources/images/lookfeel.png b/resources/images/lookfeel.png
index 661457cf61..2f62ae6ded 100644
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diff --git a/resources/images/trash.png b/resources/images/trash.png
index d237e83988..3fcf940149 100644
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diff --git a/src/calibre/gui2/comments_editor.py b/src/calibre/gui2/comments_editor.py
index 7aa647e209..451ae4414f 100644
--- a/src/calibre/gui2/comments_editor.py
+++ b/src/calibre/gui2/comments_editor.py
@@ -1185,7 +1185,8 @@ class Editor(QWidget):  # {{{
 
 
 if __name__ == '__main__':
-    app = QApplication([])
+    from calibre.gui2 import Application
+    app = Application([])
     w = Editor()
     w.resize(800, 600)
     w.show()