DiskUsage won't launch with many mounted volumes

[humdinger]

This is hrev54083, 32bit.

When starting DiskUsage, only a grey window pops up, pegging one core. I had this for some time, but nobody else could reproduce. I finally found what's different for me: I got 7 partitions mounted. That, I guess, trips up DiskUsage when setting up the tabs for those volumes. This from the debug report:

0x71844830	0x2383b11	VolumeTab::IconWidth(VolumeTab) + 0xd 
...
		0x718448d0	0x23840bd	ControlsView::VolumeTabView::TabFrame(ControlsView::VolumeTabView, int32) + 0x1c5 
		0x71844970	0x15e4b36	BTabView::DrawTabs() + 0x162 
		0x718449b0	0x15e4922	BTabView::Draw(BRect) + 0x32 
		0x718449f0	0x160cf3e	BView::_Draw(BRect) + 0x92 
		0x71844bc0	0x1612350	BWindow::DispatchMessage(BMessage*, BHandler*) + 0xf04 
		0x71844c20	0x1616d04	BWindow::task_looper() + 0x2d0 
		0x71844c50	0x1528c99	BLooper::_task0_(void*) + 0x3d 
		0x71844c78	0xcbeccb	thread_entry + 0x27 
		00000000	0x61638258	commpage_thread_exit + 0

After unmounting one of my partitions, the tabs of the remaining volumes fit in the DiskUsage default window size and it starts.
If I then increase the window size, the next time I launch DiskUsage with all 7 partitions mounted, they'll fit in the bigger window and DiskUsage launches OK.

[humdinger]

Is this related: When slowly decreasing the window size, DiskUsage seizes up when the tab labels begin to be truncated, pegging a core with this debug report:

0x7a8bed64	0x1b125a0	BList::ItemAt(BList, int32) + 0x14 
...
		0x7a8bed94	0x1a59c50	BTabView::TabAt(BTabView, int32) + 0x24 
		0x7a8bee30	0x86a0ba	ControlsView::VolumeTabView::TabFrame(ControlsView::VolumeTabView, int32) + 0x1c2 
		0x7a8beed0	0x1a58b36	BTabView::DrawTabs() + 0x162 
		0x7a8bef10	0x1a58922	BTabView::Draw(BRect) + 0x32 
		0x7a8bef50	0x1a80f3e	BView::_Draw(BRect) + 0x92 
		0x7a8bf120	0x1a86350	BWindow::DispatchMessage(BMessage*, BHandler*) + 0xf04 
		0x7a8bf180	0x1a8ad04	BWindow::task_looper() + 0x2d0 
		0x7a8bf1b0	0x199cc99	BLooper::_task0_(void*) + 0x3d 
		0x7a8bf1d8	0x23b4ccb	thread_entry + 0x27 
		00000000	0x60d2b258	commpage_thread_exit + 0 

[pulkomandy]

Fixed in hrev54175.

[nielx]

Assign tickets with status=closed and resolution=fixed within the R1/beta2 development window to the R1/beta2 Milestone