Added
- Update translations (#1397, #1305)
- Filter Library and Boards Manager listings by category, type (#1361, #177)
- Updatable library and boards platform notifications, with "Update All" option (#1361, #1188)
- Communicate to user when upload is impossible due to no board selection (#1353, #845)
- Link compiler errors to editor (#1275, #118, arduino/Arduino#3383)
Changed
- Make error message from compiling without board selected more user friendly (#1353, #62)
- Remove File > Close Editor menu item (#1351, #660)
- Close compilation/upload error notifications on subsequent actions (#1275, #1154)
Fixed
- Ambiguous character check done inappropriately on "Output" panel text (#1375, #1210)
- "Built-in" libraries can have higher priority than platform bundled libraries (#1370, #1055)
- Incomplete Library and Boards Manager listings (#1361, #716)
- Hang during "Downloading index: ..." process (#1358, arduino/arduino-cli#1804, arduino/arduino-cli#1828, #1330)
- Incorrect mouseover graphic for dirty indicator (#1351, #1034, #647)
- Unnecessary save confirmation dialog when closing unmodified temporary sketch (#1351, #1274, #1026)
- Inconsistent save confirmation dialogs on exit (#1351, #1016)
- Save as native file dialog pops when enabling auto-save on a temp sketch (#1351, #994)
- Missing internationalization for UI strings (#1341)
- Missing port labels (#1335, #1331, #567)
- Failure of OTA upload to ESP8266 boards (#1335, #740)
- Network ports not shown in "Board Selector" menu (#1332, #1327)
- Multiple boards/ports shown as selected in "Board Selector" menu (#1328, #928)
- Incorrect port selection after upload to native USB board (#1328, #710, #287)
- Port changes when board is unplugged (#1328, #180)
- No auto-update offer when using a nightly build (#1326, #1318)
- Dialogs UI scalability (#1311, #1309)
Full Changelog: 2.0.0-rc9.2...2.0.0-rc9.3