Wrong display size on dimension lines

In the сurrent drawing prefences -> length factor  exhibited a value of 0.5.
I enter in the command prompt line size @20.
Choose Tools -> Dimension -> Aligned,  paint dimension line on a drawing and shows me the number 10. This is wrong, should be shown in accordance with the scale (factor length).
How to fix this error the program?
The program QCAD is not, it shows the size correctly.

LibreCAD
Version: 2.2.0-alpha
Compiler: GNU GCC 5.4.0
Compiled on: Apr 28 2017
Qt Version: 5.5.1
Boost Version: 1.58.0
System: Ubuntu 16.04.2 LTS

In LibreCAD Length Factor manipulates the distance written in the dimensioning against the real value. So a line with a length of 20 units will be shown as 10 if a length factor of 0.5 is applied. If you measure it with the measuring tool it still will be 20. I'm not sure what this feature is good for, maybe if you really want to draw scaled down. Normally in CAD you draw with real world values, scaling down is done in the printing procedure. So normally the length factor should be 1.
The setting General Scale is about adjusting the size of text, numbers, dimensioning elements to the intended print scale. So you can define all your favorite settings valid for all possible scales and just enter the print scale here, for 1:100 it's 100.
That's what in QCAD is "size scale factor".

Setting length factor in document settings does not affect the measurement tools in the document. Clearly a mistake.




LibreCAD
Version: 2.1.3
Compiler: GNU GCC 8.2.1
Compiled on: Nov  8 2018
Qt Version: 5.12.3
Boost Version: 1.68.0


ArchLinux 64 with last kernel

If you do : 100.58*0.08117 then you find 8.16. This is what you see on the dimension so it does not look like a mistake from LibreCAD...

The length factor modify only the value of dimension not the actual size of the entity. If you want to do that then you need to scale the part.

It's a bad idea. When I change the size of the picture (scale)  it disappears.

I joined your threads about this issue.

Also I got your point about this, but I wouldn't call it a bug.
Dimensions and measurement are different tools and I see pros and cons for both solutions, the current way and your interpretation.

I'll gonna create a feature request for this.
My idea is to implement a checkbox in application preferences, "use dimension scale for measurement".
This option allows the user to choose what the measuring tools should show.

Armin

follow up: https://github.com/LibreCAD/LibreCAD/issues/1127

The scaled picture returns after doing an Autozoom.
This has been fixed in the latest 2.2.0 RC version.