>>> My Info: Win7_64, Nightly 48, 32bit, ID 20160320030409 STR: 1. Open new window. Open as many tabs as possible without causing overflow in tabs toolbar 2. Hover mouse over the center of the last tab, hold left mouse button 3. Remember where's the center of the 1st tab is located 4. Move mouse pointer to the place you remembered in Step 3 5. Press Ctrl key ('keydown' then 'keyup') 6. Move mouse pointer to the right by 10px, then to the left by 10px AR: In Steps 5 and 6 the dragging tab is placed on top of background tab ER: The background tabs (including the 1st tab) should slide to the right in Step 5 or at least in Step 6 to leave free space for the dragging tab
Created attachment 8733355 [details] screencast 1 (bug 1258689) - dragging tab appears right on top of background tab.webm Correction! Actual result: After Step 5 the dragging tab teleports to the end of list After Step 6 the dragging tab appears under mouse pointer again, but now it's on top of the 1st tab Expected result is either X or Y: X) After Step 5 the dragging tab should appear under mouse pointer, and background tabs should slide to the right to leave free space for the dragging tab Y) (weaker than X) The dragging tab should appear under mouse pointer at_least in Step 6, and background tabs should slide to the right to leave free space for the dragging tab
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