Huge import/export no longer freezes the game

[SafeteeWoW]

What causes the lag?

• Editbox widget in multiline mode cant handle huge text properly.
  • See http://www.wowinterface.com/forums/showthread.php?p=315500
• LootHistory:ExportTSV(), LootHistory:ExportCSV(), etc costs little time, and do not contribute to lag.
  • We don't need to concern about the performance of above functions, really.

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Changelog

• TLDR: No lag in Import/Export. No matter how large it is.
• Export:
  • When the export is huge, we display the export in a single line editbox to avoid freezing the game
  • Even if only one line is shown, the newline character \n can still be copied and pasted correctly.
  • This completely removes lag.
  • User can no longer modify text in export editbox.
  • Done by resetting the content of editbox on OnTextChanged event
  • WeakAuras2 export can cause lag, so I don't use WeakAuras2 code for export
• Import:
  • Import still uses multiline editbox, but only shows first 2500 bytes to avoid freezing the game
  • Credit to WeakAuras 2: See https://github.com/WeakAuras/WeakAuras2/blob/master/WeakAurasOptions/OptionsFrames/ImportExport.lua
  • The editbox is SetMaxBytes to 2500 characters and we use OnChar event to fetch the characters.
  • Autofocus editbox when import frame opens
• The width and height of import/export frame is changed.
  • This matches the width/height radio of history frame.
  • The other reason of this change is that I added some description of the editboxes. I need to increase the width to fully show those description

[evil-morfar]

I'm aware the editbox causes the lag - my other comment was about I didn't like adding a lot of code for little gain. One thing worth mentioning is the way lua handles strings: creating/changing a lot of them is generally a bad idea, and should be avoided when possible - hence the usage of table.concat.

While I don't really like the aesthetics of a single line, I do think it's very much worth including if it can remove the lag. Maybe it's worth only using the single line version for consistency?

[SafeteeWoW]

I like to have both versions. I like to have multiple line version to enable preview, whenever possible. I don't want to lose feature that already works fine for small exports. I also want to do large export, so I create single line version. Indeed, aesthetics of a single line is bad, but this is probably the only solution until Blizzard fixes multiline EditBox widget for large string.