wrong characters are shown instead of dots in password QLineEdit

[sierdzio]

Weird! Sorry, but I ran out of ideas how to help here :-(

I've looked through known Qt bugs, the only one remotely related is https://bugreports.qt.io/browse/QTBUG-23626?jql=text ~ "echoMode" but I don't think that's it.

[jsulm]

@Paul-Busovikov Are you changing anything related to fonts and style in your app? For example style-sheets?

[Paul Busovikov]

@jsulm yes, I have style-sheet for those widgets, but I've tried same sheets for the build where I have no problem

that is the one of them, can it spoil something?

.QLineEdit
{
    min-height: 32px;
    qtproperty-hsizetype="Maximum";
    border-radius: 2px;
    border-style: solid;
    border-width: 1px;
    border-color: rgb(0,0,0,25%);
    margin-top: 4px;
    margin-bottom: 4px;
}

.QLineEdit::focus
{
    border-color: rgb(0,147,196, 85%);
}

.QLineEdit:hover
{
    border-color: rgb(0,0,0,40%);
}

.QLineEdit:disabled
{
    border-color: rgb(0,0,0,25%);
    background-color: rgb(255,255,255, 50%);
    color: rgb(0,0,0, 50%);
}

[jsulm]

@Paul-Busovikov I would try without this style-sheet to be sure

[Paul Busovikov]

@jsulm I've tried without style-sheets, the problem still here

[jsulm]

@Paul-Busovikov When you start your app do you see any warnings/errors? You build your app on Debian but execute on Mint: did you deploy it (http://doc.qt.io/qt-5/linux-deployment.html)? Could be that it doesn't find the font and falls back to some other font.

[Paul Busovikov]

@jsulm it does find the font, I saw the differences and features of particular fonts
I deploy it by coping qt libraries (which were used during the compilation in sandbox) and their dependencies and qtplugins and fonts into a path available for app
During the work there are no warnings or errors

Can it be some codec problem? I suppose it is UTF-8 in both cases. How can I check it?
Just printed 10000 characters to see how it looks like

QString s;
for ( int i = 1; i < 10000; ++i )
{
     s.append( QChar(i) );
}
ui->textEdit->setText(s);

There are 2 variants

[jsulm]

@Paul-Busovikov In the second output you can see that much less characters can be properly shown. To me it really looks like a font issue. Internally QString uses UTF-16.

[Paul Busovikov]

@jsulm you are right

QFontDatabase().families().join(" | ")

gave me some clue
The first app returned whole list of families and the second one returned the only one which I deployed

QFontDatabase::addApplicationFont( "fontDir/myFont.ttf" );

but I don't understand where both apps are looking for fonts
how can I force the app to look for in /usr/local/fonts not only in my deployed font directory?

[Paul Busovikov]

And for what reason qt would not use fontconfig ?

[Paul Busovikov]

I don't figure out why fontconfig don't work
But I have solved this particular issue by adding path to free fonts in QT_QPA_FONTDIR

[jsulm]

@Paul-Busovikov said in wrong characters are shown instead of dots in password QLineEdit:

And for what reason qt would not use fontconfig ?

For example because it was built without fontconfig support. Did you build Qt by yourself?

[Paul Busovikov]

@jsulm Thanks for answer. No, I didn't, but I have a log of building

So, as far as I understood it is the reason

[18:57:36] :	 [Step 2/2]      [exec] Qt Gui:
[18:57:36] :	 [Step 2/2]      [exec]   FreeType ............................... yes
[18:57:36] :	 [Step 2/2]      [exec]     Using system FreeType ................ no
[18:57:36] :	 [Step 2/2]      [exec]   HarfBuzz ............................... yes
[18:57:36] :	 [Step 2/2]      [exec]     Using system HarfBuzz ................ no
[18:57:36] :	 [Step 2/2]      [exec]   Fontconfig ............................. no
[18:57:36] :	 [Step 2/2]      [exec]   Image formats:
[18:57:36] :	 [Step 2/2]      [exec]     GIF .................................. yes
[18:57:36] :	 [Step 2/2]      [exec]     ICO .................................. yes
[18:57:36] :	 [Step 2/2]      [exec]     JPEG ................................. yes
[18:57:36] :	 [Step 2/2]      [exec]       Using system libjpeg ............... no
[18:57:36] :	 [Step 2/2]      [exec]     PNG .................................. yes
[18:57:36] :	 [Step 2/2]      [exec]       Using system libpng ................ no

Also for the people who got similar issue there is the way to change password character by style-sheet

lineedit-password-character: 42;

[jsulm]

@Paul-Busovikov If you would like to know why fontconfig was built execute configure again with additional -v parameter and check the output. I guess you're missing fontconfig header files (dev package).