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When scrolling source file using scroll bars the line numbers lag so bad you will miss the line number you are searching for. I have noticed this in the CDT editor and assume it is not unique to CDT.
Created attachment 282335 [details] source and line numbers temporarily out of sync Hi Trampas, Thanks for the bug report. I have been able to reproduce this, although my machine may be a little fast as I can only see a problem if I take a screen recording and examine adjacent frames. I used screentogif[1] at 60Hz and I can see places where a single frame has line number and comment mismatched. It takes between 15 and 30ms approx for the line numbers to catch up - I guess you are seeing a longer time to catch up if you are noticing the slowness. I have attached a frame showing the misalignment with Eclipse 4.15 and the plain text editor. [1] https://www.screentogif.com/
My machine is a Rzyen 7 with 8 cores, GTX 1050TI, 32GB ram, 1TB SDD. So I do not consider it slow, but I am using a 4k Screen with display scaling at 125% here is a video of what I see, it is worse on large files. https://photos.app.goo.gl/omZKT9Z3Uz4nzxdd7
This type of problem also happens when scrolling by scrollwheel / touchpad / touchscreen. It also seems to be unrelated to source code complexity. It is less severe (but still noticeable) even with a simple .txt file. For anyone unable to duplicate this problem: if you use a "traditional" scroll wheel (where one notch of the wheel scrolls by an entire line or more) this problem is hard to see. Try scrolling with a modern touchpad, or touchscreen, or a mouse with a high-resolution scroll wheel (like some Logitech mice.) This will let you scroll by a few *pixels* at a time, and it becomes blindingly obvious that the line numbers lag behind the text. Is there a reason for why the rendering of line numbers and rendering of text lag by even a millisecond? I would have expected the rendering code for those regions to be called sequentially.
