In the composer, allow the user to delete a selection from the first character forward

app/src/components/composer-editor/base-block-plugins.tsx

@@ -401,9 +401,15 @@ export default [
       if (event.key !== 'Backspace' || event.shiftKey || event.metaKey || event.optionKey) {
         return;
       }
-      const { focusText, focusOffset, document } = change.value;
+      const { selection, focusText, focusOffset, document } = change.value;
       const firstText = document.getFirstText();
-      if (focusOffset === 0 && focusText && firstText && firstText.key === focusText.key) {
+      if (
+        selection.isCollapsed &&
+        focusOffset === 0 &&
+        focusText &&
+        firstText &&
+        firstText.key === focusText.key
+      ) {
         event.preventDefault();
         return true;
       }

snap/snapcraft.template.yaml

@@ -26,15 +26,13 @@ parts:
     source: ./app/dist/mailspring-MAILSPRING_VERSION-amd64.deb
     source-type: deb
     # Correct path to icon.
-    after:
-      - desktop-gtk3
-    override-build: |
-      set -ex
-      snapcraftctl build
+    prepare: |
       sed -i 's|Icon=mailspring|Icon=/usr/share/pixmaps/mailspring\.png|' usr/share/applications/mailspring.desktop
       mkdir -p $SNAPCRAFT_PART_INSTALL/share/themes
       mkdir -p $SNAPCRAFT_PART_INSTALL/share/icons
       mkdir -p $SNAPCRAFT_PART_INSTALL/share/sounds
+    after:
+      - desktop-gtk3
     stage:
       - share/icons
       - share/themes