Ghost effect displaying fonts in editor.

[angellinares]

The editor displays ghosted fonts in a Note 8 with 4.4.2.

P. S. : I just found that if I disable syntax highlight the problem disappears ;)

[angellinares]

[Calsign]

@angellinares: I had thought that this issue was resolved a long time ago. The fact that only some of the keywords are offset is confusing.

By any chance, did you originally create this file with a different editor (on a desktop, perhaps)? My hunch is that the indentation at the beginning of the problematic lines is something funky, like a tab, instead of two spaces.

Does this problem show up anywhere else? Did this start appearing in any particular version of APDE (the syntax highlighter hasn't changed much for several releases, now...)?

Also, I find it strange that the tab bar doesn't appear in your screenshots. Is this an off-chance glitch (known, unresolved bug), or has it never been present? If you don't know what I'm talking about, then the latter is likely the case. The tab bar can be seen in the screenshots on Google Play. This may be another bug.

[girobusan]

Same for me, under 5th Android, example sketch.

[phyrik]

Old thread, I know, but I have same bug on Hudl2 running 5.1 lollipop although only happens when I edit text that is already there.

[EmmanuelPil]

@phyrik
This mostly happens to me when I copy/ past text from the forum or elswhere. Sometimes the code does not even run because of some invisible character. To prevent this I take the text firstly to "this" edit box on github, paste it and then copy it again. In some way this will "clean" the text and also will format it properly.
(It will not be pasted as one single line that you need to format and rearange the comments)

[readman999]

This is an old thread, but I'm posting here because I'm experiencing the same issue.

I was looking forward to the update.

I immediately tried it on my Xiaomi POCO F7, but the screen display is distorted.

On my ALLDOCUBE iPlay 70 mini Ultra tablet, which also uses the Japanese language,
there were no problems as long as I didn't write anything in Japanese,
just like the previous version.

The image is a sample sketch of particles.

(Google Translate)

[Calsign]

I think the current syntax highlighter is fundamentally broken and needs to be replaced. I wrote it when I was 13 and didn't know what I was doing.

Unfortunately I don't have time to work on any nontrivial APDE features, including this issue. But if someone else is interested in taking a crack at it, I'm happy to offer suggestions and review PRs.

The syntax highlighter code is in CodeEditText.java. It assumes that all characters are uniform-width and measures 'm' to determine that width, then calculates the positions of all highlighted tokens based on the assumed width and heights of each character.

APDE requests a monospace font, but this isn't respected on some devices which is an obvious failure mode. But this also breaks down because even monospace fonts have some characters that aren't uniform width, including tabs, other whitespace characters, and perhaps also Japanese characters.

I think the solution is to switch to spans, which are Android's supported way of marking up text. The hard part is probably making this robust and functional across the full range of Android versions that APDE supports.