In XCode 7 beta 4 on the latest El Capitan developer preview (and previous version as well), the XCode editor is nearly unusable when editing near the end of a long Swift file: when making edits in the last few screenfuls of a ~1000 line file, especially if copypasting code or deleting lines but also while just typing, the editor constantly jumps to a different position. Sometimes this even happens so that the text rendering glitches and shows the old position text but new position line numbers in the gutter, and one has to "paint" the screen with the selection to reveal the actual text corresponding to the editor location.
Editor glitch when editing near end of long file
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