Review Request 113871: Make the handling of the "maximum text lines" setting in Icons View more robust

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This review has been submitted with commit 70cfa627e5a402f209c2eb1f3cfbc839d61740ad by Frank Reininghaus to branch master.

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On Nov. 15, 2013, 8:15 a.m., Frank Reininghaus wrote:
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> https://git.reviewboard.kde.org/r/113871/
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> (Updated Nov. 15, 2013, 8:15 a.m.)
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> Review request for Dolphin and Christoph Feck.
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> Bugs: 308022 and 323841
>     http://bugs.kde.org/show_bug.cgi?id=308022
>     http://bugs.kde.org/show_bug.cgi?id=323841
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> Repository: kde-baseapps
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> Description
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> If the user sets a maximum number of text lines in the settings, this number is translated into a maximum height in pixels using QFontMetrics::lineSpacing().
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> In In KStandardItemListWidgetInformant::itemSizeHint(int, const KItemListView*), this maximum height limits the size that is reserved for the item.
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> However, in KStandardItemListWidget::updateIconsLayoutTextCache(), the maximum height is translated back into a maximum number of lines, which limits the number of lines that are created using the QTextLayout.
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> This approach can lead to problems if the real height of the layouted text is 1 pixel more or less than QFontMetrics::lineSpacing() times "number of lines". According to Christoph's analysis, this is the reason for the blurry icons in bug 323841.
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> I propose to change this by not storing a "maximum height" inside the "maximum size" explicitly, but store a maximum number of lines and a maximum with (for Compact View) separately, and then use the number of lines also to calculate the required size in KStandardItemListWidgetInformant::itemSizeHint(int, const KItemListView*). This should make sure that the correct height is reserved for each item. It also makes the code a bit simpler IMHO.
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> Diffs
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>   dolphin/src/kitemviews/kitemliststyleoption.h 1a304fc 
>   dolphin/src/kitemviews/kitemliststyleoption.cpp ac25879 
>   dolphin/src/kitemviews/kitemlistview.cpp 7f49721 
>   dolphin/src/kitemviews/kstandarditemlistwidget.cpp 302150f 
>   dolphin/src/views/dolphinitemlistview.cpp 4799d76 
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> Diff: https://git.reviewboard.kde.org/r/113871/diff/
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> Testing
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> I could not see any regressions. I was not able to reproduce the bug, so I cannot really verify if this patch really fixes it.
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> @Christoph: your comment in bug 323841 sounds like you could reproduce the problem? Could you have a look at this patch? Thanks in advance!
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> Thanks,
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> Frank Reininghaus
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