Scale logo only for custom ones

Signed-off-by: Julius Härtl <jus@bitgrid.net>

apps/theming/css/theming.scss

 #header .logo,
 #header .logo-icon {
 	background-image: url(#{$image-logo});
+	@if $theming-logo-mime != '' {
+		background-size: contain;
+	}
 }
 
 #body-login,

apps/theming/lib/ThemingDefaults.php

 
 		$variables = [
 			'theming-cachebuster' => "'" . $this->config->getAppValue('theming', 'cachebuster', '0') . "'",
+			'theming-logo-mime' => "'" . $this->config->getAppValue('theming', 'logoMime', '') . "'",
+			'theming-background-mime' => "'" . $this->config->getAppValue('theming', 'backgroundMime', '') . "'"
 		];
 
 		$variables['image-logo'] = "'".$this->urlGenerator->getAbsoluteURL($this->getLogo())."'";

apps/theming/tests/ThemingDefaultsTest.php

 	public function testGetScssVariables() {
 		$this->config->expects($this->at(0))->method('getAppValue')->with('theming', 'cachebuster', '0')->willReturn('0');
 		$this->config->expects($this->at(1))->method('getAppValue')->with('theming', 'logoMime', false)->willReturn('jpeg');
-		$this->config->expects($this->at(2))->method('getAppValue')->with('theming', 'cachebuster', '0')->willReturn('0');
-		$this->config->expects($this->at(3))->method('getAppValue')->with('theming', 'backgroundMime', false)->willReturn('jpeg');
+		$this->config->expects($this->at(2))->method('getAppValue')->with('theming', 'backgroundMime', false)->willReturn('jpeg');
+		$this->config->expects($this->at(3))->method('getAppValue')->with('theming', 'logoMime', false)->willReturn('jpeg');
 		$this->config->expects($this->at(4))->method('getAppValue')->with('theming', 'cachebuster', '0')->willReturn('0');
-		$this->config->expects($this->at(5))->method('getAppValue')->with('theming', 'color', null)->willReturn($this->defaults->getColorPrimary());
-		$this->config->expects($this->at(6))->method('getAppValue')->with('theming', 'color', $this->defaults->getColorPrimary())->willReturn($this->defaults->getColorPrimary());
-		$this->config->expects($this->at(7))->method('getAppValue')->with('theming', 'color', $this->defaults->getColorPrimary())->willReturn($this->defaults->getColorPrimary());
+		$this->config->expects($this->at(5))->method('getAppValue')->with('theming', 'backgroundMime', false)->willReturn('jpeg');
+		$this->config->expects($this->at(6))->method('getAppValue')->with('theming', 'cachebuster', '0')->willReturn('0');
+		$this->config->expects($this->at(7))->method('getAppValue')->with('theming', 'color', null)->willReturn($this->defaults->getColorPrimary());
+		$this->config->expects($this->at(8))->method('getAppValue')->with('theming', 'color', $this->defaults->getColorPrimary())->willReturn($this->defaults->getColorPrimary());
+		$this->config->expects($this->at(9))->method('getAppValue')->with('theming', 'color', $this->defaults->getColorPrimary())->willReturn($this->defaults->getColorPrimary());
 
 		$this->util->expects($this->any())->method('invertTextColor')->with($this->defaults->getColorPrimary())->willReturn(false);
 		$this->cache->expects($this->once())->method('get')->with('getScssVariables')->willReturn(null);
 
 		$expected = [
 			'theming-cachebuster' => '\'0\'',
+			'theming-logo-mime' => '\'jpeg\'',
+			'theming-background-mime' => '\'jpeg\'',
 			'image-logo' => "'absolute-custom-logo?v=0'",
 			'image-login-background' => "'absolute-custom-background?v=0'",
 			'color-primary' => $this->defaults->getColorPrimary(),