Created attachment 8710544 [details] screenshot 1 - resizer isn't placed directly under mouse cursor during resizing.png >>> My Info: Win7_64, Nightly 46, 32bit, ID 20160121030208 STR_1: 1. Open Devtools, dock it to the bottom side of window. Right-click Menu(≡), disable "Menu bar" item 2. Resize the devtools to make it at least 100px in height, release left mouse button. 3. Press F10 to show the Menu bar 4. Hover mouse over the devtools resizer 5. Hold left mouse button 6. Move mouse a bit to the up and down (~20-30px) to see the result STR_2: 1. Open Bookmarks sidebar, resize it to make as narrow as possible 2. Open Devtools, dock it to the right side of window. Resize the devtools to make as wide as possible 3. Hover mouse over the devtools resizer. 4. Hold left mouse button. Move mouse a bit to the left and right to make sure drag-n-drop has started 5. Press Ctrl+B to hide Bookmarks sidebar 6. Move mouse a bit to the left and right (~20-30px) to see the result AR: Resizer is moving at the distance ~30px (STR_1) or ~150px (STR_2) from mouse cursor ER: Mouse cursor should be positioned exactly over the dropmarker
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