(Win) GL1 driver issues [updated]

Hardware:
EDITED, UPDATED - tested on another 2 desktops too, with Nvidia 1050ti and IntelHD Graphics 4600, both Win10x64.

• Retroarch 1.9.0 stable, Retroarch_2020-09-15_nightly, x64 windows build.
• Asus eeePC 1015PEM, Win7x64, intel GMA 3150 (driver ver 8.14.10.2230), 1024x600.
• Only OpenGL1 hardware support.

Bug 1:

• it happens only when used GL1 driver.
• it happens ONLY when graphical widgets DISABLED.
• it triggered by any text, for example if you enable FPS-meter.

Steps:

• Start retroarch windowed at 2x scaler.
• Disable graphical widgets, and enable FPS-meter (for example, bug triggered by any text).
• Start any core/any game.
• You'll see 1x-scaled picture at bottom left side.
• Bug not gone when you go to to fullscreen, then go back.

Bug 2:

• it happens only when used GL1 driver.
• it happens independently of graphical widgets enabled or disabled.

Steps:

• Start retroarch windowed at 2x scaler, for example.
• Set: settings - video - scaling - aspect ratio - custom:

Custom Aspect Ratio (X Position) = 0
Custom Aspect Ratio (Y Position) = 0
Custom Aspect Ratio (Width) = 640
Custom Aspect Ratio (Height) = 480
Crop Overscan = ON

• run ROM

You'll see half-picture is hidden at bottom screen.
Enter fullscreen (press F), then go back windowed (press F again) - bug is gone.

configs in attach:
buggy.zip

BTW, GL1 driver doesn't keep aspect ratio in fullscreen mode, it always stretched.
GLcore and GL doesn't have this problem.

EDITED, UPDATED 16.09.2020

Reproduce both GL1 failures on the listed Windows hardware using the attached buggy.zip, including disabled widgets, FPS text, custom scaling, and fullscreen toggling. Compare the initial windowed output with the post-toggle output; done means correct scaling, visible picture content, and preserved fullscreen aspect ratio without requiring a fullscreen transition.